EC 2.1.1.292     
Accepted name: carminomycin 4-O-methyltransferase
Reaction: S-adenosyl-L-methionine + carminomycin = S-adenosyl-L-homocysteine + daunorubicin
Glossary: daunorubicin = (+)-daunomycin = (8S,10S)-8-acetyl-10-[(2S,4S,5S,6S)-4-amino-5-hydroxy-6-methyloxan-2-yl]oxy-6,8,11-trihydroxy-1-methoxy-9,10-dihydro-7H-tetracene-5,12-dione
carminomycin = (1S,3S)-3-acetyl-3,5,10,12-tetrahydroxy-6,11-dioxo-1,2,3,4,6,11-hexahydrotetracen-1-yl 3-amino-2,3,6-trideoxy-α-L-lyxo-hexopyranoside = (1S,3S)-3-acetyl-3,5,10,12-tetrahydroxy-6,11-dioxo-1,2,3,4,6,11-hexahydronaphthacen-1-yl 3-amino-2,3,6-trideoxy-α-L-lyxo-hexopyranoside
carubicin = (1S,3S)-3-acetyl-3,5,12-trihydroxy-10-methoxy-6,11-dioxo-1,2,3,4,6,11-hexahydrotetracen-1-yl 3-amino-2,3,6-trideoxy-α-L-lyxo-hexopyranoside
= (8S,10S)-8-acetyl-10-[(3-amino-2,3,6-trideoxy-α-L-lyxo-hexopyranosyl)oxy]-6,8,11-trihydroxy-1-methoxy-7,8,9,10-tetrahydronaphthacene-5,12-dione
Other name(s): DnrK; DauK
Systematic name: S-adenosyl-L-methionine:carminomycin 4-O-methyltransferase
Comments: The enzymes from the Gram-positive bacteria Streptomyces sp. C5 and Streptomyces peucetius are involved in the biosynthesis of the anthracycline daunorubicin. In vitro the enzyme from Streptomyces sp. C5 also catalyses the 4-O-methylation of 13-dihydrocarminomycin, rhodomycin D and 10-carboxy-13-deoxycarminomycin [3].
References:
1.  Connors, N.C. and Strohl, W.R. Partial purification and properties of carminomycin 4-O-methyltransferase from Streptomyces sp. strain C5. J. Gen. Microbiol. 139 Pt 6 (1993) 1353–1362. [PMID: 8360627]
2.  Jansson, A., Koskiniemi, H., Mantsala, P., Niemi, J. and Schneider, G. Crystal structure of a ternary complex of DnrK, a methyltransferase in daunorubicin biosynthesis, with bound products. J. Biol. Chem. 279 (2004) 41149–41156. [PMID: 15273252]
3.  Dickens, M.L., Priestley, N.D. and Strohl, W.R. In vivo and in vitro bioconversion of ε-rhodomycinone glycoside to doxorubicin: functions of DauP, DauK, and DoxA. J. Bacteriol. 179 (1997) 2641–2650. [PMID: 9098063]
[EC 2.1.1.292 created 2013]